What type of plant is this?

I am a new home owner. Most of the plants were dead when I moved in. I started watering to see if I could revive them and this outcropping in two areas came up with these plants scattered around a dead bougainvillea plant. I don't know what they are and they tripled in size in the 2 weeks I started watering them. They are near 6 almost dead Lantana plants and a tree that may be a Palo Brea.